Furnace



J. WEBER.

(No Model.)

FURNACE.

No. 425,393. Patented Apr. 8, 1890,

mummumnmm OOOOOOOOO OOOOOOOOO z/Jw Magma OOOOOOOOO UNITED STATES PATENT OFFICE.

JOHN XVEBER, OF CHICAGO, ILLINOIS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 425,393, dated April 8, 1890.

i Application filed December 30, 1889- gerial No. 335,467. (No model.)

To all whom it may concern:

Be it known that I, J OHN \VEBER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Furnace, of which the following is such a full and clear description as will enable others skilled in the art to make and use the same, the accompanying drawings, with the letters of reference marked thereon, being a part of this specification.

My invention has for its object the prevention of smoke by the perfect combustion of the gaseous products of the coal before allowing them to be cooled below the temperature of ignition by contact with the boiler or flues.

In the drawings, like letters indicate like parts in the several views.

Figure 1 is a side elevation of the boiler provided with my improved furnace, the furnace being shown in section. Fig. 2 is a crosssection of the boiler through the dotted line to a: in Fig. 1. Fig. 3 is a front elevation of the fire-door. Fig. 4 is a sectional elevation of the door with the butterfly-valve open.

A is the boiler.

was the dome.

C O O are openings through the bridgewall, which should be given a combined area equal to seventy-five per cent. of the sum of the areas of all the tubesin the boiler and of a length equal to six times the radius of the are of the circle which forms the top of the opening through the bridge-wall.

F is the combustion-chamber, which is intended to produce a whirling or eddying motion to the escaping gases after they have passed through the openings 0 (J O, and by retarding their motion toward the end of boiler to allow for complete combustion before entering the tubes.

to isa nozzle of a steam-pipe contracted and bent so as to direct a small jet of steam into the center of the openings 0 O O.

b is a globe-valve for regulating the quantity of steam admitted to the furnace.

c is the steam-pipe leading to the dome B of the boiler, from whence the supply is taken. This steam-pipe, it will be observed, gradually increases in size from the nozzle Ct to the dome. The object of this construction is to prevent unnecessary friction and consequent condensation of steam in the pipes, it being necessary for my purpose to obtain as dry steam as possible. I g

G is the fire-door of the furnace, provided with the butterfly-valve h and ratchet-lever -i.

J is an annular space between the bridgewall and the boiler, which I fill with asbestus paper or some other elastic non-combustible material, to allow for the expansion of the boiler without producing unnecessary pressure on the bridge-wall.

7c is a space extending from the space J to the rear of the bridge-wall, to allow the heated gases to pass around the boiler, so that too much surface will not be shielded from the heat, which might produce an unequal expansion and probable tendency to buckle the sheet in contact with the bridge-wall.

H is the damper or ash-pit door made in the usual form.

(1 is a dead-plate; c, the grates, which are placed at an angle inclining toward the bridgewall, for the purpose of allowing the incandescent coals to be easily pushed back to the bridge-wall, and also for allowing the air from the ash-pit to pass more directly through the grates and at a less angle of inclination to their surface in its passage to the fines O O C than would be the case if the grates were placed level.

g g g are air-inlets to the fines C C C. These air inlets or boxes may be connected together by the pipes f f f, or the box may be one continuous casting extending clear through.

To operate my furnace, I fire up in the usual manner until steam is raised to a sufficient pressure to give me a dry sharp blast through the contracted nozzle 0,; then by opening the globe-valve b the blast can be regulated so that the gases will be almost entirely consumed before having passed through the openings O G O in the bridge-wall. These openings will by this time have been brought to a very high temperature, and the dry-steam jet will immediately on entering the openings be decomposedinto its coustituentgases-oxygen and hydrogen. The explosive effect of this decomposition will tend to distribute the oxygen through every part of the now rapidly consuming gases, tending to thoroughlyignite the whole mass. The air-boxes g g 9 being embedded in the hot bridge-wall will admit small jets of air perpendicular to the current of the gases through the openings 0 O O, which being admitted at the point where the oxygen already supplied to the burning gases will have been nearly consumed, this fresh supply of air perpendicular to the current of the escaping gases will tend to a still more thorough admixture of additional oxygen to the gases just at the critical time when carbonic oxide would be formed for want of the necessary oxygen to complete combustion.

I am aware that prior to my invention steam-jets have been used in the furnaces of steam-boilers, but not in the manner in which I use them. I therefore do not claim, broadly, the use of a steam-jet; but

What I do claim is structed substantially as shown and described and in the manner herein set forth.

In testimony whereof I hereunto subscribe my name, this 11th day of December, A. D. 1889, in the presence of two witnesses.

JOHN WEBER.

WVitnesses:

H. W. BOYD, W. L. WEBER.

space is, openings 0 G O, combustion-cham- ,ber F, and rear bridge-wall E, when con- 

